package tuic import ( "context" "crypto/tls" "net" "strings" "time" "github.com/Dreamacro/clash/adapter/inbound" CN "github.com/Dreamacro/clash/common/net" "github.com/Dreamacro/clash/common/sockopt" C "github.com/Dreamacro/clash/constant" LC "github.com/Dreamacro/clash/listener/config" "github.com/Dreamacro/clash/listener/sing" "github.com/Dreamacro/clash/log" "github.com/Dreamacro/clash/transport/socks5" "github.com/Dreamacro/clash/transport/tuic" "github.com/gofrs/uuid/v5" "github.com/metacubex/quic-go" "golang.org/x/exp/slices" ) const ServerMaxIncomingStreams = (1 << 32) - 1 type Listener struct { closed bool config LC.TuicServer udpListeners []net.PacketConn servers []*tuic.Server } func New(config LC.TuicServer, tunnel C.Tunnel, additions ...inbound.Addition) (*Listener, error) { if len(additions) == 0 { additions = []inbound.Addition{ inbound.WithInName("DEFAULT-TUIC"), inbound.WithSpecialRules(""), } } h := &sing.ListenerHandler{ Tunnel: tunnel, Type: C.TUIC, Additions: additions, } cert, err := CN.ParseCert(config.Certificate, config.PrivateKey) if err != nil { return nil, err } tlsConfig := &tls.Config{ MinVersion: tls.VersionTLS13, Certificates: []tls.Certificate{cert}, } if len(config.ALPN) > 0 { tlsConfig.NextProtos = config.ALPN } else { tlsConfig.NextProtos = []string{"h3"} } quicConfig := &quic.Config{ MaxIdleTimeout: time.Duration(config.MaxIdleTime) * time.Millisecond, MaxIncomingStreams: ServerMaxIncomingStreams, MaxIncomingUniStreams: ServerMaxIncomingStreams, EnableDatagrams: true, Allow0RTT: true, } quicConfig.InitialStreamReceiveWindow = tuic.DefaultStreamReceiveWindow / 10 quicConfig.MaxStreamReceiveWindow = tuic.DefaultStreamReceiveWindow quicConfig.InitialConnectionReceiveWindow = tuic.DefaultConnectionReceiveWindow / 10 quicConfig.MaxConnectionReceiveWindow = tuic.DefaultConnectionReceiveWindow packetOverHead := tuic.PacketOverHeadV4 if len(config.Token) == 0 { packetOverHead = tuic.PacketOverHeadV5 } if config.CWND == 0 { config.CWND = 32 } if config.MaxUdpRelayPacketSize == 0 { config.MaxUdpRelayPacketSize = 1500 } maxDatagramFrameSize := config.MaxUdpRelayPacketSize + packetOverHead if maxDatagramFrameSize > 1400 { maxDatagramFrameSize = 1400 } config.MaxUdpRelayPacketSize = maxDatagramFrameSize - packetOverHead quicConfig.MaxDatagramFrameSize = int64(maxDatagramFrameSize) handleTcpFn := func(conn net.Conn, addr socks5.Addr, _additions ...inbound.Addition) error { newAdditions := additions if len(_additions) > 0 { newAdditions = slices.Clone(additions) newAdditions = append(newAdditions, _additions...) } connCtx := inbound.NewSocket(addr, conn, C.TUIC, newAdditions...) metadata := sing.ConvertMetadata(connCtx.Metadata()) if h.IsSpecialFqdn(metadata.Destination.Fqdn) { go func() { // ParseSpecialFqdn will block, so open a new goroutine _ = h.ParseSpecialFqdn( sing.WithAdditions(context.Background(), newAdditions...), conn, metadata, ) }() return nil } go tunnel.HandleTCPConn(connCtx) return nil } handleUdpFn := func(addr socks5.Addr, packet C.UDPPacket, _additions ...inbound.Addition) error { newAdditions := additions if len(_additions) > 0 { newAdditions = slices.Clone(additions) newAdditions = append(newAdditions, _additions...) } tunnel.HandleUDPPacket(inbound.NewPacket(addr, packet, C.TUIC, newAdditions...)) return nil } option := &tuic.ServerOption{ HandleTcpFn: handleTcpFn, HandleUdpFn: handleUdpFn, TlsConfig: tlsConfig, QuicConfig: quicConfig, CongestionController: config.CongestionController, AuthenticationTimeout: time.Duration(config.AuthenticationTimeout) * time.Millisecond, MaxUdpRelayPacketSize: config.MaxUdpRelayPacketSize, CWND: config.CWND, } if len(config.Token) > 0 { tokens := make([][32]byte, len(config.Token)) for i, token := range config.Token { tokens[i] = tuic.GenTKN(token) } option.Tokens = tokens } if len(config.Users) > 0 { users := make(map[[16]byte]string) for _uuid, password := range config.Users { users[uuid.FromStringOrNil(_uuid)] = password } option.Users = users } sl := &Listener{false, config, nil, nil} for _, addr := range strings.Split(config.Listen, ",") { addr := addr ul, err := net.ListenPacket("udp", addr) if err != nil { return nil, err } err = sockopt.UDPReuseaddr(ul.(*net.UDPConn)) if err != nil { log.Warnln("Failed to Reuse UDP Address: %s", err) } sl.udpListeners = append(sl.udpListeners, ul) var server *tuic.Server server, err = tuic.NewServer(option, ul) if err != nil { return nil, err } sl.servers = append(sl.servers, server) go func() { err := server.Serve() if err != nil { if sl.closed { return } } }() } return sl, nil } func (l *Listener) Close() error { l.closed = true var retErr error for _, lis := range l.servers { err := lis.Close() if err != nil { retErr = err } } for _, lis := range l.udpListeners { err := lis.Close() if err != nil { retErr = err } } return retErr } func (l *Listener) Config() LC.TuicServer { return l.config } func (l *Listener) AddrList() (addrList []net.Addr) { for _, lis := range l.udpListeners { addrList = append(addrList, lis.LocalAddr()) } return }